Docu update.

NEWS

@@ -12,9 +12,10 @@ Version 1.9.9 (29 October 2020):
      * showattribute: added wildcard support
      * Diff: added option maxcount=<num>: Stop after num different fields
      * Select: added parameter dom (day of month, e.g. 29feb)
-   New operators:sellonlatbox,-180,180,-90,90 "breaks" lon_bnds [Bug #9801]
+   New operators:
      * Yearly arithmetic: yearadd, yearsub, yearmul, yeardiv
      * apply: Apply an operator on each input file
+     * gh2hl: Interpolate 3D geometric height to height levels
      * verifygrid: Verify grid coordinates
      * addtrend: Add trend
      * isosurface: Extract isosurface

doc/tex/mod/Vertintgh

 @BeginModule
 @NewPage
 @Name      = Vertintgh
-@Title     = Vertical height interahpolation
+@Title     = Vertical height interpolation
 @Section   = Interpolation
 @Class     = Interpolation
 @Arguments = infile outfile

src/operator_help.h

@@ -4404,7 +4404,7 @@ static const char *VertintapHelp[] = {
 
 static const char *VertintghHelp[] = {
     "NAME",
-    "    gh2hl - Vertical height interahpolation",
+    "    gh2hl - Vertical height interpolation",
     "",
     "SYNOPSIS",
     "    gh2hl,hlevels  infile outfile",